Continuous clip applier drive mechanism

Abstract

The present invention belongs to the field of medical device technology, and in particular relates to a continuous-fire clip applier drive mechanism. The present invention addresses the problem in the prior art of requiring another transmission method to replace the special-shaped cam, and provides a continuous-fire clip applier drive mechanism comprising a clamp head and a clamp head push rod connected to the clamp head at one end, the clamp head push rod having a clamp head propulsion structure connected to the end away from the clamp head, a drive handle drivingly connected to the clamp head propulsion structure, and a tissue clamp propulsion structure that propels the tissue clamp via the tissue clamp push rod. A transmission structure having a clamping distance compensation function is provided between the drive handle and the tissue clamp propulsion structure, and the drive handle is drivingly connected to the tissue clamp propulsion structure via the transmission structure. The present invention utilizes a transmission structure having a clamping distance compensation function to replace the previously used special-shaped cam structure, thereby avoiding the problems associated with the use of the special-shaped cam structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a continuous-firing clip applier driving mechanism. Background Art

[0002] A clip applier is a surgical instrument used to clamp tissue during surgical procedures. Tissue clips are typically made of metal, such as titanium, but can also be made of other materials, such as plastic. To clamp a tissue clip, it must first be pushed out of the clip applier, and then the clamp head is used to close the tissue clip to achieve clamping. However, some tissue clips, such as those made of plastic, will automatically pop open significantly when pushed out to the position of the clamp applier head, which causes inconvenience to medical staff during surgical operations.

[0003] The applicant has also tried to solve the problem by adopting a step-by-step feeding method. That is, a two-step clamping of the clamp head is achieved by a first feeding mechanism and a second feeding mechanism. The first feeding mechanism first completes the first step to clamp the clamp head to a certain opening. In this way, when the tissue clamp is pushed out, the amplitude of the automatic opening action of the tissue clamp can be effectively reduced. Then, the second feeding mechanism is used to slowly clamp the clamp until it is completely closed. However, the problem that follows is how to control the timing of pushing out the tissue clamp. If the uniform speed pushing method adopted by the clamp applicator in the prior art is used, it is obviously not well matched with the two-step clamping action. If the applying action of the clamp applicator clamp head and the pushing action of the tissue clamp are controlled by two sets of mechanisms respectively, the product structure will become very complicated and inconvenient to operate.

[0004] Therefore, the applicant has proposed to use a cam control mechanism to solve this problem and applied for a patent for this technical solution, [application number: 202111375725.5]. This invention patent includes a tissue clip propulsion structure for pushing the tissue clip, and also includes a driving handle. One side of the driving handle is provided with a special-shaped cam driven by the driving handle, and the special-shaped cam is provided with a special-shaped groove. The special-shaped groove is composed of several arc segments with different distances from the rotation center of the special-shaped cam. A transmission assembly is provided between the special-shaped cam and the tissue clip propulsion structure, and one end of the transmission assembly is slidably connected in the special-shaped groove, and the other end is rotatably connected to the tissue clip propulsion structure.

[0005] Later, during actual use, it was found that the transmission efficiency of the special-shaped cam needed to be improved, and the cam itself was a rigid structure and could not provide a deformation redundancy for the slight deformation of the tissue clamp. Therefore, another transmission method was needed to replace the special-shaped cam. Summary of the Invention

[0006] The object of the present invention is to address the above-mentioned problem and provide a continuous clamp applier driving mechanism that is more suitable for the step-by-step clamping action of the clamp head.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A continuous clamp driving mechanism includes a clamp head and a clamp head push rod at one end connected to the clamp head. Moving the clamp head push rod can drive the clamp head to open or clamp. The end of the clamp head push rod away from the clamp head is connected to a clamp head propulsion structure. The driving handle is drivingly connected to the clamp head propulsion structure and also includes a tissue clamp propulsion structure. The tissue clamp propulsion structure pushes the tissue clamp through the tissue clamp push rod. A transmission structure with a clamping distance compensation function is provided between the driving handle and the tissue clamp propulsion structure. The driving handle is drivingly connected to the tissue clamp propulsion structure through the transmission structure.

[0009] In the above-mentioned continuous clip applier driving mechanism, the clamp head propulsion structure and the tissue clip propulsion structure are both cylindrical and are arranged in a sleeve-like manner.

[0010] In the above-mentioned continuous clip applier driving mechanism, the axis centers of the clamp head propulsion structure and the tissue clip propulsion structure coincide with or are parallel to each other.

[0011] In the above-mentioned continuous clamp driving mechanism, the transmission structure includes a transmission body whose two ends are respectively connected to the driving handle and the tissue clamp propulsion structure. The transmission body is provided with a compensation component with variable length. When the driving handle drives the transmission body, the length of the compensation component can be stretched.

[0012] In the above-mentioned continuous clamp driving mechanism, the compensation component includes a spring, one end of which is fixedly connected to the transmission body and the other end is fixedly connected to the slider. The slider is slidably connected in the transmission body and connected to the driving handle through a crank.

[0013] In the above-mentioned continuous clip applier driving mechanism, the spring extends along the length direction of the transmission body, and the axis of the spring is parallel to the center line of the transmission body; two springs are provided and symmetrically arranged on both sides of the transmission body.

[0014] In the above-mentioned continuous clip applier driving mechanism, the transmission body is a rod or a cylinder.

[0015] In the above-mentioned continuous clamp driving mechanism, the transmission body includes a long transmission rod, one end of which is connected to the tissue clamp propulsion structure, and the other end is provided with a sliding groove, the slider is slidably connected in the sliding groove, and one end of the crank is rotatably connected to the slider.

[0016] In the above-mentioned continuous clip applier driving mechanism, the sliding groove passes through both side surfaces of the transmission body, and both end surfaces of the sliding groove are arc-shaped. Sliding the slider can make the end surface of the slider fit with the end surface of the sliding groove.

[0017] In the above-mentioned continuous clamp driving mechanism, the sliding groove is connected on both sides with guide grooves that pass through the side of the transmission rod, the side of the slider is fixedly connected with a guide block, and the end of the guide block protrudes to the outside of the guide groove, and the spring is fixedly connected to the guide block.

[0018] Compared with the existing technology, the advantages of the present invention are:

[0019] 1. The present invention utilizes a transmission structure with a clamping distance compensation function to replace the previously used special-shaped cam structure, thereby avoiding the problems caused by the use of the special-shaped cam structure.

[0020] 2. The present invention provides a length-variable compensation component on the transmission body. In this way, when the driving handle drives the clamp head to clamp, the driving handle compensates for the drive of the tissue clamp propulsion structure through the elongation of the compensation component, so that the tissue clamp propulsion structure remains relatively stationary during the clamping process, avoiding interference between the mechanisms.

[0021] 3. The compensation component of the present invention is a spring, which has elasticity and preload force. The preload force can be maintained all the time, thereby covering some minor deformations and position deviations caused by the tissue clip.

[0022] 4. The present invention has a simple structure, is easy to use, has a low manufacturing cost, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of Example 1;

[0024] Figure 2 It is a structural diagram of part of the structure of Example 1;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 is a structural diagram of the transmission structure in Example 1;

[0027] Figure 5 is a structural diagram of the transmission structure in Example 2;

[0028] In the figure: forceps head 1, forceps head push rod 2, forceps head propulsion structure 3, drive handle 4, tissue clamp propulsion structure 5, tissue clamp push rod 6, transmission structure 100, transmission body 101, compensation assembly 102, spring 103, slider 104, crank 105, transmission rod 106, sliding groove 107, guide groove 108, guide block 109, hollow cylinder 201, mounting head 202, sliding guide column 203. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] This embodiment provides a continuous clip applier driving mechanism, combined with Figure 1-4 As shown, it includes a pliers head 1 and a pliers head push rod 2 at one end connected to the pliers head 1. Moving the pliers head push rod 2 can drive the pliers head 1 to open or clamp. The end of the pliers head push rod 2 away from the pliers head 1 is connected to a pliers head propulsion structure 3, and a driving handle 4 is drivingly connected to the pliers head propulsion structure 3. It also includes a tissue clamp propulsion structure 5, and the tissue clamp propulsion structure 5 pushes the tissue clamp through the tissue clamp push rod 6. A transmission structure 100 with a clamping distance compensation function is provided between the driving handle 4 and the tissue clamp propulsion structure 5, and the driving handle 4 is drivingly connected to the tissue clamp propulsion structure 5 through the transmission structure 100.

[0032] The transmission structure 100 includes a transmission body 101 connected at both ends to the driving handle 4 and the tissue clip propulsion structure 5, respectively. The transmission body 101 is provided with a length-variable compensation component 102. When the driving handle 4 drives the transmission body 101, the length of the compensation component 102 is stretched. The transmission body 101 can be a rod structure or a cylindrical structure.

[0033] During use, the driving handle 4 is rotated to push the forceps head propulsion structure 3 and the tissue clamp propulsion structure 5, thereby driving the forceps head 1 and the tissue clamp through the forceps head push rod 2 and the tissue clamp push rod 6 respectively. When the tissue clamp enters the forceps head 1 and the forceps head 1 needs to be clamped, the compensation component 102 is stretched, so that the tissue clamp propulsion structure 5 remains relatively stationary, that is, the compensation component 102 compensates the driving amount of the driving handle 4 on the tissue clamp propulsion structure 5 by the stretching amount. Therefore, the present invention is provided with a length-variable compensation component 102 on the transmission body 101. In this way, when the driving handle 4 drives the forceps head to clamp, the driving handle 4 compensates the driving of the tissue clamp propulsion structure 5 by the extension amount of the compensation component 102, so that the tissue clamp propulsion structure 5 remains relatively stationary during the clamping process, avoiding interference between the mechanisms. At the same time, the present invention uses a transmission structure 100 with a clamping distance compensation function to replace the previously used special-shaped cam structure, avoiding the problems caused by the use of the special-shaped cam structure.

[0034] Preferably, the forceps head pushing structure 3 and the tissue clamp pushing structure 5 are both cylindrical and are arranged in a sleeve-type manner. Such a structure is relatively compact and can effectively save installation space.

[0035] Preferably, the axis lines of the forceps head propulsion structure 3 and the tissue clamp propulsion structure 5 coincide with or are parallel to each other, so as to ensure the consistency of the driving directions of the tissue clamp and the forceps head 1, thereby ensuring the stability of the clamping process.

[0036] like Figure 4 As shown, the compensation component 102 includes a spring 103, one end of the spring 103 is fixedly connected to the transmission body 101, and the other end is fixedly connected to the slider 104. The slider 104 is slidably connected in the transmission body 101 and is connected to the driving handle 4 through the crank 105.

[0037] Preferably, the spring 103 extends along the length of the transmission body 101, and the axis of the spring 103 is parallel to the center line of the transmission body 101. This ensures that the direction in which the spring 103 extends is parallel to the direction in which the driving handle 4 is driven through the transmission body 101.

[0038] Preferably, two springs 103 are provided and symmetrically arranged on both sides of the transmission body 101. This can ensure uniform force distribution and prevent the problem of tilting.

[0039] like Figure 4 As shown, the transmission body 101 includes an elongated transmission rod 106. One end of the transmission rod 106 is connected to the tissue clip propulsion structure 5, and the other end is provided with a sliding groove 107. The slider 104 is slidably connected to the sliding groove 107, and one end of the crank 105 is rotatably connected to the slider 104. The sliding groove 107 is connected to both sides by guide grooves 108 that extend through the sides of the transmission rod 106. A guide block 109 is fixedly connected to the side of the slider 104, and the end of the guide block 109 protrudes outside the guide groove 108. The spring 103 is fixedly connected to the guide block 109. The guide groove 108 and the guide block 109 cooperate to provide guidance, thereby regulating the extension direction of the spring 103.

[0040] Preferably, the sliding groove 107 passes through both side surfaces of the transmission body 101, and both end surfaces of the sliding groove 107 are arc-shaped. Sliding the slider 104 allows the end surfaces of the slider 104 to fit into the end surfaces of the sliding groove 107. This prevents a high-force rigid collision between the slider 104 and the transmission body 101, which could damage the slider 104 and the transmission body 101.

[0041] The prior art's use of this shaped cam has lower transmission efficiency than the transmission structure 100 of the present application. Furthermore, the cam itself is a rigid structure, lacking any deformation redundancy for even minor deformations of the tissue clip. The present invention's compensation assembly 102 includes a spring 103, which is retractable and provides a preload. This preload is maintained, thereby compensating for minor deformations and positional deviations of the tissue clip.

[0042] The working principle of the present invention is as follows: when in use, the driving handle 4 is rotated to push the forceps head propulsion structure 3 and the tissue clamp propulsion structure 5, thereby driving the forceps head 1 and the tissue clamp through the forceps head push rod 2 and the tissue clamp push rod 6 respectively. At this time, due to the preload force of the spring 103, the spring 103 cannot be stretched, so that the driving handle 4 drives the tissue clamp propulsion structure 5 to move, that is, at this time, the mechanism for driving the forceps head and the tissue clamp propulsion structure 5 for driving the tissue clamp are synchronously driven by the handle. When the tissue clamp enters the forceps head 1 and the forceps head 1 needs to be clamped, the tissue clamp propulsion structure 5 at the rear has no room to move, so that when the driving handle 4 continues to drive, the spring 103 is stretched, so that the tissue clamp propulsion structure 5 remains relatively still, that is, the spring 103 is stretched so that the driving amount of the driving handle 4 on the tissue clamp propulsion structure 5 is compensated. Therefore, the present invention is provided with a compensation component 102 with a variable length on the transmission body 101. In this way, when the driving handle 4 drives the clamp head to clamp, the driving handle 4 compensates for the drive of the tissue clamp propulsion structure 5 through the elongation of the compensation component 102, so that the tissue clamp propulsion structure 5 remains relatively stationary during the clamping process, avoiding interference between the mechanisms.

[0043] Example 2

[0044] This embodiment provides a continuous clip applier driving mechanism, the specific structure of which is substantially the same as that of the embodiment 1, except that the specific structure of the transmission body 101 is combined with the Figure 5 As shown, the transmission body 101 includes a hollow cylinder 201 and a mounting head 202 fixedly connected to one end of the hollow cylinder 201. The spring 103 is fixedly connected to the mounting head 202 at one end and fixedly connected to the slider 104 at the other end. The slider 104 is fixedly connected to a sliding guide post 203 at one end. The sliding guide post 203 extends into the hollow cylinder 201 and is slidably connected to the hollow cylinder 201. The inner surface of the hollow cylinder 201 is in contact with the outer surface of the sliding guide post 203. The compensation principle of the transmission structure 101 using this specific structure is the same as the principle in Example 1. Both achieve compensation by using the spring 103 to have a preload force. When the preload force is exceeded, the spring 103 will be stretched.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0046] Although the present invention generally uses terms such as the forceps head 1, the forceps head push rod 2, the forceps head propulsion structure 3, the driving handle 4, the tissue clamp propulsion structure 5, the tissue clamp push rod 6, the transmission structure 100, the transmission body 101, the compensation assembly 102, the spring 103, the slider 104, the crank 105, the transmission rod 106, the sliding groove 107, the guide groove 108, the guide block 109, the hollow cylinder 201, the mounting head 202, and the sliding guide post 203, the use of other terms is not excluded. The use of these terms is merely for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A driving mechanism for a continuous-fire clamp applier, comprising a clamp head (1) and a clamp head push rod (2) connected at one end to the clamp head (1), wherein the clamp head (1) can be opened or clamped by moving the clamp head push rod (2), and the clamp head push structure (3) is connected to the end of the clamp head push rod (2) away from the clamp head (1), and a driving handle (4) is drivingly connected to the clamp head push structure (3), characterized in that: The device further comprises a tissue clamp propulsion structure (5), wherein the tissue clamp propulsion structure (5) propels the tissue clamp via a tissue clamp push rod (6), and a transmission structure (100) having a clamping distance compensation function is provided between the driving handle (4) and the tissue clamp propulsion structure (5), and the driving handle (4) is connected to the tissue clamp propulsion structure (5) via the transmission structure (100); The transmission structure (100) comprises a transmission body (101) whose two ends are respectively connected to a driving handle (4) and a tissue clamp propulsion structure (5); a compensation component (102) with a variable length is provided on the transmission body (101); and the length of the compensation component (102) can be stretched when the driving handle (4) drives the transmission body (101); The compensation assembly (102) includes a spring (103), one end of the spring (103) is fixedly connected to the transmission body (101), and the other end is fixedly connected to a slider (104), and the slider (104) is slidably connected in the transmission body (101) and connected to the driving handle (4) via a crank (105); The transmission body (101) is a rod or a cylinder; The transmission body (101) includes a transmission rod (106) in the form of an elongated strip, one end of the transmission rod (106) is connected to the tissue clamp propulsion structure (5), and the other end is provided with a sliding groove (107), the slider (104) is slidably connected in the sliding groove (107), and one end of the crank (105) is rotatably connected to the slider (104); The two sides of the sliding groove (107) are connected to guide grooves (108) that pass through the side of the transmission rod (106); the side of the slider (104) is fixedly connected to a guide block (109), and the end of the guide block (109) protrudes to the outside of the guide groove (108); the spring (103) is fixedly connected to the guide block (109).

2. The continuous clip applier driving mechanism according to claim 1, wherein: The forceps head pushing structure (3) and the tissue clamp pushing structure (5) are both cylindrical and are arranged in a sleeve-like manner.

3. The continuous clip applier driving mechanism according to claim 2, wherein: The axis lines of the forceps head propulsion structure (3) and the tissue clamp propulsion structure (5) coincide with or are parallel to each other.

4. The continuous clip applier driving mechanism according to claim 1, wherein: The spring (103) extends along the length direction of the transmission body (101), and the axis of the spring (103) is parallel to the center line of the transmission body (101); two springs (103) are provided and symmetrically arranged on both sides of the transmission body (101).

5. The continuous clip applier driving mechanism according to claim 1, wherein: The sliding groove (107) passes through the two side surfaces of the transmission body (101), and both end surfaces of the sliding groove (107) are arc-shaped. Sliding the slider (104) can make the end surface of the slider (104) and the end surface of the sliding groove (107) fit together.

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